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Top Forums Shell Programming and Scripting Extract certain columns from big data Post 302821581 by happypoker on Friday 14th of June 2013 05:29:27 PM
Old 06-14-2013
Quote:
Originally Posted by rveri
happypoker,
You can use gnu awk and use array for the desired columns to store and print the data.
Thank you! I'm able to get the list column # into an array, but still don't know how to print those corresponding columns out.

The data is something like:
Code:
000 A B C D 2.22 3.4 1.03 .....
001 B F S D 3.2 2.1 3.2 2.3 .....
....
...
132 F S F X 2.3 3.4 5.3 2.1 ....

It has about 6600 columns and 30,000,000 lines. It's too big to put the needed columns in some array, I have to print the needed columns line by line.

Last edited by Scrutinizer; 06-17-2013 at 03:10 AM.. Reason: code tags
 

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COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME
colrm -- remove columns from a file SYNOPSIS
colrm [start [stop]] DESCRIPTION
The colrm utility removes selected columns from the lines of a file. A column is defined as a single character in a line. Input is read from the standard input. Output is written to the standard output. If only the start column is specified, columns numbered less than the start column will be written. If both start and stop columns are spec- ified, columns numbered less than the start column or greater than the stop column will be written. Column numbering starts with one, not zero. Tab characters increment the column count to the next multiple of eight. Backspace characters decrement the column count by one. ENVIRONMENT
The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7). EXIT STATUS
The colrm utility exits 0 on success, and >0 if an error occurs. SEE ALSO
awk(1), column(1), cut(1), paste(1) HISTORY
The colrm command appeared in 3.0BSD. BSD
August 4, 2004 BSD
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